REUTERS - North Korea fired five short-range projectiles into the sea off its east coast on Monday, South Korea's military said, amid heightened tension over the isolated country's nuclear and rocket programs.
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The unidentified projectiles were launched from south of the city of Hamhung and flew about 200 km (120 miles), landing in waters east of North Korea, South Korea's Joint Chiefs of Staff said in a statement.
On Friday, North Korea fired two mid-range ballistic missiles into the sea in defiance of tough new UN and U.S. sanctions slapped on the country following nuclear and rocket tests earlier this year.
"North Korea should refrain from all provocative actions, including missile launches, which are in clear violation of U.N. resolutions," Sung Kim, the U.S. special envoy for North Korea, told reporters in Seoul when asked about Monday's firing.
In recent weeks, North Korea has stepped up its bellicose rhetoric, threatening pre-emptive nuclear strikes against Washington and Seoul and firing short-range missiles and artillery into the sea.
The North protests annual ongoing joint U.S.-South Korea military drills.
North Korean leader Kim Jong Un said last week that the country would soon test a nuclear warhead and ballistic missiles capable of carrying nuclear warheads in what would be a direct violation of UN resolutions that have the backing of Pyongyang's chief ally, China.
Chinese Foreign Ministry spokeswoman Hua Chunying said China was "deeply concerned" about the situation on the Korean peninsula.
"We hope North Korea does not do anything to contravene UN Security Council resolutions. We also hope all sides can remain calm and exercise restraint and avoid doing anything to exacerbate confrontation or tensions," she told a daily news briefing.